WO2022041873A1 - Appareil d'affichage et circuit d'alimentation d'étage - Google Patents

Appareil d'affichage et circuit d'alimentation d'étage Download PDF

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Publication number
WO2022041873A1
WO2022041873A1 PCT/CN2021/095347 CN2021095347W WO2022041873A1 WO 2022041873 A1 WO2022041873 A1 WO 2022041873A1 CN 2021095347 W CN2021095347 W CN 2021095347W WO 2022041873 A1 WO2022041873 A1 WO 2022041873A1
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WIPO (PCT)
Prior art keywords
voltage
power supply
circuit
feedback
output
Prior art date
Application number
PCT/CN2021/095347
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English (en)
Chinese (zh)
Inventor
庞震华
杨杰
刘广学
张玉欣
赵彩霞
徐爱臣
Original Assignee
海信视像科技股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from CN202010857296.4A external-priority patent/CN111901932B/zh
Priority claimed from CN202110138504.XA external-priority patent/CN112785971B/zh
Priority claimed from CN202110177726.2A external-priority patent/CN114913817B/zh
Application filed by 海信视像科技股份有限公司 filed Critical 海信视像科技股份有限公司
Publication of WO2022041873A1 publication Critical patent/WO2022041873A1/fr
Priority to US17/900,166 priority Critical patent/US11825577B2/en

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/36—Circuits for reducing or suppressing harmonics, ripples or electromagnetic interferences [EMI]
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/34—Voltage stabilisation; Maintaining constant voltage
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • H05B45/382—Switched mode power supply [SMPS] with galvanic isolation between input and output
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • H05B45/385—Switched mode power supply [SMPS] using flyback topology
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/63—Generation or supply of power specially adapted for television receivers

Definitions

  • the present application relates to the field of display technology, and in particular, to a display device and a ladder power supply circuit.
  • Embodiments of the present application provide a display device, including: a display screen configured to display an image; a sound reproduction device configured to play sound; at least one light-emitting diode (LED) light bar configured to light the display screen; a power supply circuit configured to supply power to a load of the display device, the load at least including the display screen, the sound reproduction device and the at least one LED light bar;
  • a display screen configured to display an image
  • a sound reproduction device configured to play sound
  • at least one light-emitting diode (LED) light bar configured to light the display screen
  • a power supply circuit configured to supply power to a load of the display device, the load at least including the display screen, the sound reproduction device and the at least one LED light bar
  • the power supply circuit includes an LLC primary winding, a first resonant converter LLC secondary winding and a second LLC secondary winding, and the first LLC secondary winding is used to convert the voltage of the LLC primary winding into a first LLC secondary winding. After the voltage is applied, it is output to the at least one LED light bar, and the second LLC secondary winding is used to convert the voltage of the LLC primary winding into a second voltage, and then output to the at least one LED light bar; so
  • the power supply circuit is specifically configured to adjust the first voltage output by the secondary winding of the first LLC to a third voltage, and use the sum of the third voltage and the second voltage to generate the at least one LED lamp bar power supply.
  • Embodiments of the present application further provide a power supply circuit, including: an LLC primary winding, a first resonant converter LLC secondary winding, and a second LLC secondary winding, where the first LLC secondary winding is used to connect the LLC primary winding After the voltage of the side winding is converted into a first voltage, it is output to the at least one LED light bar, and the second LLC secondary winding is used to convert the voltage of the LLC primary side winding into a second voltage, and then output to the at least one LED light bar. At least one LED light bar output; the power supply circuit is specifically configured to adjust the first voltage output by the secondary winding of the first LLC to a third voltage, and pass the third voltage and the second voltage. and powering the at least one LED light bar.
  • a power supply circuit including: an LLC primary winding, a first resonant converter LLC secondary winding, and a second LLC secondary winding, where the first LLC secondary winding is used to connect the LLC primary winding After the voltage of the side winding is converted into a first voltage,
  • Embodiments of the present application further provide a display device, including: a display screen configured to display an image; a plurality of LED driving components, each LED driving component is used to supply power to the connected multi-channel light-emitting diode LED light bars, so The LED light bar is configured to light up the display screen; a power supply circuit is configured to supply power to the plurality of LED driving components; wherein the power supply circuit is specifically configured to generate a first voltage and a second voltage, The plurality of LED driving components are powered by the first voltage and the second voltage at the same time.
  • Embodiments of the present application further provide a negative voltage ladder power supply circuit, configured to supply power to a plurality of LED driving components, including: an LLC primary winding, configured to receive an input voltage; a first LLC secondary winding, the first LLC secondary winding The positive poles of the LLC secondary windings are respectively connected to the positive poles of the plurality of LED driving components, and the negative poles of the first LLC secondary winding are grounded; the first LLC secondary winding is configured to convert the input voltage into a first After the voltage is applied, the first voltage is output to the positive poles of the plurality of LED driving components; the negative poles of the first LLC secondary windings are grounded; the second LLC secondary windings, the positive poles of the second LLC secondary windings are grounded , the negative poles of the second LLC secondary winding are respectively connected to the negative poles of the plurality of LED driving components; the second LLC secondary winding is configured to convert the input voltage into a second voltage, and then send the voltage to the plurality of LED driving components.
  • an LLC primary winding
  • the positive poles of the LED driving components output the second voltage; a plurality of voltage adjustment modules, the positive poles of the first LLC secondary windings are connected to the corresponding positive poles of the LED driving components through the voltage regulation modules; the LED driving components
  • the component is configured to send a feedback signal to the voltage adjustment module according to the working voltage of the connected multi-channel LED light bar; the voltage adjustment module is configured to drive the multi-channel LED in opposite directions according to the feedback signal
  • the first voltage output by the component is adjusted.
  • each of the LED driving components is connected to the corresponding voltage adjustment module through one of the feedback circuits; the feedback circuit is configured to receive the first feedback signal output by the LED driving component, After a feedback signal is converted into a second feedback signal, the second feedback signal is output to the voltage adjustment module; wherein the reference ground levels of the first feedback signal and the second feedback signal are different.
  • Embodiments of the present application further provide a display device, which includes: a backlight module and a display panel; wherein the backlight module includes a plurality of power supplies, a controller, and lamp areas corresponding to the plurality of power supplies; the plurality of power supplies and The plurality of lamp zones are connected through the controller; the multiple power sources include two types of power sources, including a first power source for providing a positive power supply signal to the controller and driving the lamp zones, and a second power source for driving the lamp zones; control Based on the received control signal and multiple power supplies, the device outputs a negative power supply signal and a negative reference signal, and uses a negative voltage drive to output a driving signal to drive the lamp area corresponding to the selected power supply to emit light, and then the lamp area projects the light to the display.
  • the panel provides backlight for the display panel; wherein the controller controls the first power supply to work and the second power supply to turn off in the standby mode, and controls the first power supply and the second power supply to work in the non-standby mode.
  • Embodiments of the present application further provide a display device, which may include: a power supply circuit, a light-emitting diode (LED) drive circuit connected to the power supply circuit, a filter circuit, and a feedback circuit, the filter circuit is further connected with the feedback circuit connect.
  • the power supply circuit is configured to supply power to the LED driving circuit; wherein, the power supply circuit includes a fixed voltage power supply unit and a variable voltage power supply unit, and the fixed voltage power supply unit is superimposed on the variable voltage power supply voltage unit On the basis of the ladder, power is supplied to the LED drive circuit.
  • the filter circuit is configured to filter the voltage ripple in the output voltage of the fixed voltage power supply unit.
  • the feedback circuit is configured to sample the output voltage of the filter circuit, and to feed back the variation of the output voltage to the controller of the variation voltage supply unit.
  • the controller is configured to control the voltage of the variable voltage power supply unit according to the feedback of the feedback circuit.
  • Embodiments of the present application further provide a display device.
  • An embodiment of the present application provides a display device.
  • the display device may include: a power supply circuit, a light emitting diode (LED driving circuit) connected to the power supply circuit, a filter circuit, and a feedback circuit , the filter circuit is also connected with the feedback circuit.
  • the power supply circuit is configured to supply power to the LED driving circuit; wherein, the power supply circuit includes a fixed voltage power supply unit and a variable voltage power supply unit, and the fixed voltage power supply unit is superimposed on the variable voltage power supply voltage unit On the basis of the ladder, power is supplied to the LED drive circuit.
  • the filter circuit is configured to filter the voltage ripple in the output voltage of the fixed voltage power supply unit.
  • the feedback circuit is configured to sample the output voltage of the filter circuit, and to feed back the variation of the output voltage to the controller of the variation voltage supply unit.
  • the controller is configured to control the voltage of the variable voltage power supply unit according to the feedback of the feedback circuit.
  • FIG. 1 is a schematic structural diagram of a display device according to one or more embodiments of the present application.
  • FIG. 2 is a schematic diagram of a connection relationship between a power supply board and a load according to one or more embodiments of the present application;
  • FIG. 3 is a schematic diagram of a power supply architecture according to one or more embodiments of the present application.
  • FIG. 4 is a schematic structural diagram of a power supply circuit according to one or more embodiments of the present application.
  • FIG. 5 is a schematic structural diagram of a power supply circuit according to one or more embodiments of the present application.
  • FIG. 6 is a schematic structural diagram of a power supply circuit according to one or more embodiments of the present application.
  • FIG. 7 is a schematic structural diagram of a power supply circuit according to one or more embodiments of the present application.
  • FIG. 8 is a schematic structural diagram of a power supply circuit according to one or more embodiments of the present application.
  • FIG. 9 is a schematic structural diagram of a power supply circuit according to one or more embodiments of the present application.
  • FIG. 10 is a schematic structural diagram of a power supply circuit according to one or more embodiments of the present application.
  • FIG. 11 is a schematic diagram of a display device according to one or more embodiments of the present application.
  • FIG. 12 is a schematic diagram of a circuit structure of a feedback circuit according to one or more embodiments of the present application.
  • FIG. 13 is a schematic diagram of a circuit structure of a feedback circuit according to one or more embodiments of the present application.
  • FIG. 14 is a schematic diagram of a circuit structure of a feedback circuit according to one or more embodiments of the present application.
  • 15 is a schematic diagram of a circuit structure of a feedback circuit according to one or more embodiments of the present application.
  • 16 is a schematic diagram of a circuit structure of a feedback circuit according to one or more embodiments of the present application.
  • 17 is a schematic diagram of a circuit structure of a feedback circuit according to one or more embodiments of the present application.
  • FIG. 18 is a schematic diagram of a circuit structure of a feedback circuit according to one or more embodiments of the present application.
  • 19 is a schematic diagram of a circuit structure of a feedback circuit according to one or more embodiments of the present application.
  • 20 is a schematic structural diagram of a display device according to one or more embodiments of the present application.
  • 21 is a schematic structural diagram of a backlight module according to one or more embodiments of the present application.
  • 22 is a schematic diagram of current flow in a lamp region according to one or more embodiments of the present application.
  • FIG. 23 is a schematic diagram of current flow in a lamp region according to one or more embodiments of the present application.
  • 24 is a schematic structural diagram of a power supply according to one or more embodiments of the present application.
  • 25 is a schematic structural diagram of a power supply according to one or more embodiments of the present application.
  • 26 is a schematic structural diagram of a power supply according to one or more embodiments of the present application.
  • FIG. 27 is a schematic structural diagram of a power supply according to one or more embodiments of the present application.
  • FIG. 28 is a schematic structural diagram of a power supply according to one or more embodiments of the present application.
  • 29 is a schematic structural diagram of an isolation mode in a negative pressure driving mode according to one or more embodiments of the present application.
  • FIG. 30 is a schematic structural diagram of an isolation manner in a negative pressure driving mode according to one or more embodiments of the present application.
  • the power supply circuit is one of the most important circuit structures in the display device, and the power supply circuit can provide power for the display device, so that the display device can operate normally.
  • Some display devices are provided with an independent power board, and some display devices combine the power board and the main board into one.
  • 1 is a schematic structural diagram of a display device according to one or more embodiments of the present application, as shown in FIG.
  • the panel 1 is used to present images to the user;
  • the backlight assembly 2 is located below the panel 1, usually some optical assemblies, used to supply sufficient brightness and uniformly distributed light sources, so that the panel 1 can display images normally, and the backlight assembly 2 also Including the backplane 20, the mainboard 3 and the power board 4 are arranged on the backplane 20, and usually some convex hull structures are formed by stamping on the backplane 20, and the main board 3 and the power board 4 are fixed on the convex hull by screws or hooks; the rear shell 5
  • the cover is arranged on the panel 1 to hide the components of the display device such as the backlight assembly 2, the main board 3 and the power board 4, and has an aesthetic effect;
  • the base 6 is used to support the display device.
  • FIG. 2 is a schematic diagram of a connection relationship between a power board and a load according to one or more embodiments of the present application.
  • the power board 4 includes an input terminal 41 and an output terminal 42 (shown in the figure).
  • the first output terminal 421 is used to light up the display screen.
  • the LED light bar is connected, the second output end 422 is connected to the audio, and the third output end 423 is connected to the main board 3 .
  • the power board 4 needs to convert the AC mains into the DC power required by the load, and the DC power usually has different specifications, for example, the audio needs 18V, the panel needs 12V, and so on.
  • FIG. 3 is a schematic diagram of a power supply architecture according to one or more embodiments of the present application.
  • the display device may include: a power supply circuit 1 , a load 2 , a control circuit 3 , and a power supply 4 , wherein,
  • the power supply 4 includes: a rectifier bridge 41, a power factor correction (Power Factor Correction, PFC) module 42 and a resonant converter (Resonant Converters, LLC) module 43, and the LLC module 43 includes a synchronous rectification circuit (not shown in FIG. 3 ).
  • the PFC module 42 is connected to the LLC module 43
  • the LLC module 43 is connected to the power supply circuit 1 and the control circuit 3 respectively.
  • the rectifier bridge 41 is used to rectify the input alternating current, and input a full-wave signal to the PFC module 42 .
  • the PFC module 42 mainly performs power factor correction on the input AC power, and outputs a stable DC bus voltage (eg, 380V) to the LLC module 43 .
  • the LLC module 43 can buck or boost the DC bus voltage input by the PFC module 42 , and output a constant voltage to the load 2 .
  • the power supply 4 may also include a flyback module (not shown in FIG. 3 ) for providing its own supply voltage and standby power to the PFC module 42 and the LLC module 43 .
  • the control circuit 3 can control whether the power supply circuit 1 is turned on, that is, whether the electric energy output by the LLC module 43 can supply power to the load 2 through the power supply circuit, so as to realize the opening or closing of the load.
  • the power supply circuit 1 is also connected to the LLC module and the load. When the power supply circuit 1 is connected, the LLC module 43 can supply power to the load 2 , and when the power supply circuit 1 is disconnected, the LLC module 43 cannot supply power to the load 2 .
  • the load 2 includes a main board 21 , a backlight assembly 22 , a display main body 23 and the like.
  • step power supply can refer to application number 202010192086.8, application date 2020-03-18, title “display device and power supply circuit”; and application number 202110137510.3, application date 2021-02-01, title “display device and The relevant introduction of "Power Supply Circuit” is incorporated into this application by reference in its entirety.
  • FIG. 4 is a schematic structural diagram of a power supply circuit according to one or more embodiments of the present application.
  • the power supply circuit includes: a power supply 11 , a filter and rectifier module 12 , a PFC module 13 , and an LLC module 14 and load.
  • the load at least includes the main board 18 and the multi-channel LED light bar shown in the figure.
  • At least two different LLC secondary windings are set in the LLC module 14 to supply power to the multi-channel LED light bar.
  • it may include: a first LLC secondary winding 142 and a second LLC secondary winding 143 ; the output terminal a of the first secondary winding 142 outputs the first voltage, and the output terminal c of the second secondary winding 143 Output the second voltage; the output end a of the second secondary winding 143 is connected to the input end b of the first secondary winding 142 ; at the same time, the input end b and the output end c of the first LLC secondary winding 142 are both connected to the voltage adjustment module 15 , the voltage adjustment module 15 can be used to adjust the first voltage output by the first LLC secondary winding 142, and the voltage adjusted by the voltage adjustment module 15 is recorded as the third voltage.
  • the voltage adjustment module 15 can adjust the third voltage and the third voltage.
  • the second voltages output by the two LLC secondary windings 142 are jointly sent to the voltage driving module 16, and the voltage driving module 16 supplies power to the multi-channel LED light bars according to the sum of the second voltage and the third voltage.
  • the second voltage output by the second LLC secondary winding 143 is equivalent to a "fixed voltage” that does not change
  • the first voltage output by the first LLC secondary winding 142 is equivalent to a changing "variable voltage”
  • an adjustable variable voltage output is added on the basis of the fixed second voltage.
  • the fixed voltage and the variable voltage output by the two secondary windings together supply power to the multi-channel LED strips.
  • This power supply form can also be called “" Ladder power supply”.
  • the first voltage output by the first LLC secondary winding is less than the second voltage output by the second LLC secondary winding.
  • the multi-channel LED light bar in Figure 5 is a 16-channel LED light bar, and each light bar includes 9 LED components, under the condition of 120mA, the voltage range required by the multi-channel LED light bar is 51.3V -58.5V with a total current of 1.92A.
  • the fixed second voltage output by the second LLC secondary winding can be set to 48V
  • the first voltage floating output output by the first LLC secondary winding can be set as 12V
  • the voltage range adjusted by the voltage adjustment module can be set to 3.3V-10.5V.
  • the DC-DC parameters for the buck topology are: the input voltage is 12V, the output voltage range is 3.3V-10.5V, and the output current is 1.92A.
  • the second voltage can be set to 40V, and the first voltage floating output can be set to 10V, then the DC-DC parameters for the boost topology structure are: input voltage 12V, output The voltage range is 11.3V-18.5V, and the output current is 1.92A.
  • the power supply circuit of this embodiment can flexibly set two different voltages respectively output by two different secondary windings, and the voltage adjustment module only needs to adjust the voltage output by one secondary winding with a smaller voltage, so as to The requirements for the withstand voltage of components such as switch tubes and capacitors in the voltage adjustment module are reduced, thereby reducing the area of the PCB where the power supply circuit is located, and finally reducing the cost of the power supply circuit.
  • the voltage driving module 16 can also send a feedback signal to the voltage adjustment module 15 according to the real-time current of the multi-channel LED light bar when supplying power to the multi-channel LED light bar, so that the voltage adjustment module 15 can adjust the voltage adjustment module 15 according to the feedback signal.
  • a voltage is adjusted to a new third voltage, thereby realizing timely and effective adjustment of the voltage by the voltage adjustment module.
  • the voltage adjustment module 15 and the voltage driving module 16 include at least two connection relationships of power supply and feedback, but when the voltage adjustment module 15 performs DC-DC adjustment, its ground point is connected to the second secondary side. The output end of the winding is connected, and its voltage value is not the grounded 0V, but is equivalent to adjusting the output voltage of the first secondary winding on the basis of the output voltage value of the second secondary winding.
  • the voltage drive module 16 The feedback signal sent to the voltage adjustment module also needs to pass through the optocoupler 17, so that the feedback signal is converted to the floating voltage through the optocoupler, and the feedback signal sent from the voltage drive module to the voltage adjustment module is optocoupler isolation, so that the optocoupler The floating voltage of the voltage adjustment module 15 on both sides and the actual ground voltage of the voltage driving module 16 are unified to prevent mutual influence between the two.
  • FIG. 5 is a schematic structural diagram of a power supply circuit according to one or more embodiments of the present application.
  • the output of the first secondary winding is The terminal is connected to the input terminal of the second secondary winding, and supplies power to the multi-channel LED light bar through the output terminal of the second secondary winding.
  • the optocoupler may not be provided to isolate the feedback signal by optocoupler.
  • FIG. 6 is a schematic structural diagram of a power supply circuit according to one or more embodiments of the present application.
  • the first LLC secondary winding outputs When the required variation range of the first voltage can be 16V/18V, the secondary winding of 16V/18V voltage can be provided for the main board as the secondary winding of the first LLC, then there is no need to set the first LLC separately at this time.
  • the secondary winding can further reduce the complexity of the power supply circuit, thereby reducing the cost.
  • a secondary winding that provides a voltage of 12V for the main board can be used as the first LLC secondary winding;
  • Other loads provide a certain voltage secondary winding as shown in the first LLC secondary winding, etc.
  • FIG. 7 is a schematic structural diagram of a power supply circuit according to one or more embodiments of the present application.
  • the power supply circuit includes: a power supply 11 , a filter and rectifier module 12 , a PFC module 13 , an LLC module 14 and a load.
  • the load at least includes the main board 18 and the LED light bar 1 and the LED light strip 2 shown in the figure.
  • the secondary winding 144 outputs a voltage of 12V to the main board 18 according to the voltage of the primary winding 141
  • the secondary winding 145 outputs according to the voltage of the primary winding 141 .
  • the voltage of the primary winding 141 provides a voltage of 18V to the output of the main board 18 .
  • Two different LLC secondary windings are set in the LLC module 14 to supply power to at least one LED light bar, and the two different LLC secondary windings include: a first LLC secondary winding 142 and a second LLC secondary winding 143;
  • the input terminal a of the first secondary winding 142 is grounded, the output terminal b of the first secondary winding 142 is connected to the input terminal c of the second secondary winding 143, and the output terminal d of the second LLC secondary winding 143 is connected to the LEDs respectively.
  • the first voltage output by the LLC secondary winding 142 is adjusted, and the adjusted voltage is denoted as the third voltage.
  • the voltage adjustment module 15 can send the third voltage to the input end c of the second secondary winding 143 .
  • the second LLC secondary winding 143 is used to output the second voltage, and the output terminal d of the second LLC secondary winding 143 sends the sum of the third voltage and the second voltage to the LED strip 1 for power supply.
  • the voltage adjustment module 16 based on the buck circuit connected to the LED light bar 2 can be used to adjust the first voltage output by the first LLC secondary winding 142, and the adjusted voltage is recorded as the fourth voltage, the voltage
  • the adjustment module 15 may send the fourth voltage to the input terminal c of the second secondary winding 143 .
  • the second LLC secondary winding 143 is used for outputting the second voltage, and the output terminal d of the second LLC secondary winding 143 sends the sum of the fourth voltage and the second voltage together to the LED strip 2 for power supply.
  • the first voltage output by the first LLC secondary winding is less than the second voltage output by the second LLC secondary winding.
  • the voltage of the fixed voltage part plus the voltage of the variable voltage part should be about the overall voltage drop required by the LED light bar, otherwise the circuit will not work normally; at the same time, the voltage drop of the fixed voltage part cannot be greater than the minimum required for the LED light to light up. voltage, otherwise the LED strip will light up uncontrollably.
  • FIG. 8 is a schematic structural diagram of a power supply circuit according to one or more embodiments of the present application.
  • the power supply circuit shown in FIG. 8 and the power supply circuit shown in FIG. 7 both adopt the following scheme: set two different The two different voltages output by the secondary windings of the LED strips together supply power to the LED light bar, and the voltage adjustment module only needs to adjust the voltage output by the secondary winding with the smaller voltage.
  • the power supply circuit in the embodiment shown in FIG. 8 adopts a single flyback structure, and the first and second secondary windings are set to output voltage through the primary winding in the single flyback structure, while the implementation shown in FIG. 7
  • the first secondary winding and the second secondary winding set in the example are based on the output voltage of the primary winding in the LLC module.
  • FIG. 9 is a schematic structural diagram of a power supply circuit according to one or more embodiments of the present application.
  • the LLC module 14 Three different LLC secondary windings are set to supply power to the LED strips 1 and 2, including: a first LLC secondary winding 142, and two second LLC secondary windings 143 and 146; wherein, the first secondary winding The input end a of the winding 142 is grounded, the output end b of the first secondary winding 142 is connected to the voltage adjustment module 15 and the voltage adjustment module 16, the input end c of the second LLC secondary winding 143 is connected to the voltage adjustment module 15, and the output end d is connected to The LED light bar 1, the input end e of the second LLC secondary winding 146 is connected to the voltage adjustment module 16, and the output end f is connected to the LED light bar 2.
  • a second secondary winding and a voltage adjustment module can be set for each LED light bar, and connected in the same way as shown in FIG. 15 . It is the same as the principle and will not be repeated here.
  • the voltage adjustment module 15 based on the boost circuit connected to the LED light bar 1 can be used to adjust the first voltage output by the first LLC secondary winding 142, and the adjusted voltage is recorded as the third voltage, and the voltage adjustment module 15 can send the third voltage to the second secondary winding 143 input c.
  • the second LLC secondary winding 143 is used to output the second voltage, and the output terminal d of the second LLC secondary winding 143 sends the sum of the third voltage and the second voltage to the LED strip 1 for power supply.
  • the voltage adjustment module 16 based on the boost circuit connected to the LED light bar 2 can be used to adjust the first voltage output by the first LLC secondary winding 142 , the adjusted voltage is the fourth voltage, and the voltage adjustment The module 15 may send the fourth voltage to the input e of the second secondary winding 146 .
  • the second LLC secondary winding 146 is used for outputting the fifth voltage, and the output end f of the second LLC secondary winding 143 sends the sum of the fourth voltage and the fifth voltage together to the LED light bar 2 for power supply.
  • the power supply circuit uses an LLC module for power supply, and the LLC module is provided with a first secondary winding, a second secondary winding and a third secondary winding.
  • the power supply circuit can also be used in The first secondary winding and the second secondary winding set in the single flyback structure output voltage through the primary winding in the single flyback structure.
  • FIG. 10 is a schematic structural diagram of a power supply circuit according to one or more embodiments of the present application.
  • the power supply circuit shown in FIG. 10 on the basis of the power supply circuit shown in FIG. 9 , if the first LLC When the required variation range of the first voltage output by the secondary winding can be 18V, the secondary winding that provides the main board with a voltage of 18V can be used as the first LLC secondary winding, and there is no need to set the first LLC separately at this time.
  • the secondary winding can further reduce the complexity of the power supply circuit, thereby reducing the cost. It can be understood that, as shown in FIG. 10, only the 18V voltage of the main board is used as an example.
  • the secondary winding that provides the main board with a 12V voltage can be used as the first voltage.
  • LLC secondary winding; or, in other possible implementations, a secondary winding that provides a certain voltage for other loads can also be used as the first LLC secondary winding shown, and the implementation is the same as the principle, and will not be repeated.
  • the power supply circuit provided by the present application only needs to set one LLC secondary winding in the LLC module to provide a negative voltage, and combine with another LLC secondary winding to provide a positive first voltage, which can be provided by two LLCs
  • the secondary windings are connected in parallel to provide voltage for the driving components of the multi-channel LED light bars connected by multiple voltage conversion circuits, so that the multiple voltage conversion circuits can be connected to the output of the same LLC secondary winding and connected to the same one.
  • the negative voltage grounding point realizes the parallel connection of multiple voltage conversion circuits in the power supply circuit, and the LLC secondary winding supplies power to multiple LED drivers at the same time. At this time, multiple voltage conversion circuits can each provide the connected LED driving components.
  • the current required by the multi-channel LED light bar will not completely rely on one secondary winding to provide all the large current, so that the current output by the secondary winding will not be too large, and it will not be necessary to set more secondary windings.
  • the ladder power supply can be realized, and the circuit structure of the power supply circuit can be simplified.
  • FIG. 11 is a schematic diagram of a display device according to one or more embodiments of the present application.
  • each LED driving component can use
  • the multi-channel LED light bars connected to all the LED driving components can be jointly used to light up the display screen of the display device.
  • the power supply circuit includes: a plug a11, a filtering and rectifying module a12, a PFC module a13 and an LLC module a14.
  • the mains alternating current (100V-240V, 50-60Hz) obtained by the power supply circuit from the plug a11
  • the mains alternating current is processed by the filter rectifier module a12 (rectifier bridge), the PFC module a13 and the LLC module a14 in turn to obtain different voltages.
  • the DC power supplies power to the load.
  • the secondary winding a143 provides a voltage of 12V to the main board a18 according to the voltage of the primary winding a141, and the secondary winding a142 according to the original
  • the voltage of the side winding a141 supplies a voltage of 18V to the main board a18.
  • the above-mentioned voltages of 12V and 18V are only examples, and the secondary winding a142 and the secondary winding a143 may respectively provide voltages of other voltage values to the main board a18.
  • the LLC module a14 through two different secondary windings, power is supplied to a plurality of driving components connected in parallel at the same time, denoted as the first LLC secondary winding and the second LLC secondary winding, wherein, The first LLC secondary winding is used to provide a positive first voltage to the plurality of LED driving components, and the second LLC secondary winding is used to provide a negative second voltage to the plurality of LED driving components.
  • the first LLC secondary winding that provides the forward first voltage may be the secondary winding a143 (the first voltage is 12V) and the secondary winding a142 (the first voltage is 18V).
  • the positive poles of the first LLC secondary winding are respectively connected to the positive poles of the plurality of LED driving components, that is, the first LLC secondary winding
  • the positive pole of the winding a143 is connected to the positive pole of the LED driving component a161 and the positive pole of the LED driving component a162 at the same time, and the negative pole of the first LLC secondary winding a143 is grounded, that is, the first LLC secondary winding takes the reference ground as the reference level.
  • the above-mentioned negative second voltage can be provided by the second LLC secondary winding a144 in the LLC module a14, wherein the positive pole a of the second LLC secondary winding is grounded, and the negative pole b of the second LLC secondary winding is connected to a plurality of LEDs respectively
  • the negative pole of the driving component that is, the negative pole of the second LLC secondary winding is connected to the negative pole of the LED driving component a161 and the negative pole of the LED driving component a162 at the same time. Since the second LLC secondary winding a144 can be used to convert the input voltage of the LLC primary winding a141 into the second voltage, the negative electrode b of the second LLC secondary winding a144 is equivalent to providing a negative second voltage at this time.
  • the power supply circuit further includes a plurality of voltage adjustment modules, each LED driving assembly is connected to a corresponding voltage adjustment module, and each voltage adjustment module can be used to adjust the voltage output to the LED assembly, the voltage
  • the adjustment module can be implemented by a buck or boost structure, or can be a DC-DC chip.
  • the first LLC secondary winding of the LLC module a14 is connected to the LED driving component a161 through the voltage adjustment module a171 , and is connected to the LED driving component a162 through the voltage adjustment module 172 .
  • the LED driving component a161 is taken as an example for description.
  • the primary winding a141 of the LLC module a14 receives the transmission from the PFC module a13
  • the input voltage of the first LLC secondary side winding a143 converts the input voltage into a first voltage (denoted as VOUT), and outputs the first voltage to the positive electrode of the LED driving component a161 through the voltage adjustment module a171, the second LLC secondary side
  • the winding a144 converts the input voltage into a second voltage, denoted as (-VLED), and outputs the second voltage to the negative pole of the LED driving component a161.
  • the LED driving component a161 it is equivalent to use the negative -VLED as the negative pole.
  • the voltages on both sides thereof are the sum of the absolute values of the first voltage VOUT and the second voltage -VLED. Since the second voltage -VLED output by the second LLC secondary winding a144 will not change, it is denoted as "fixed voltage”, and the first voltage output by the first LLC secondary winding a143 can be adjusted by the voltage adjustment module a171, denoted as " Therefore, the fixed voltage and the variable voltage output by the two secondary windings together supply power to the multi-channel LED light strips, so as to realize the ladder power supply.
  • the first voltage VOUT output by the first LLC secondary winding a143 is less than the absolute value of the second voltage -VLED output by the second LLC secondary winding.
  • the LED driving component a161 can also determine the operating voltage of the connected LED light bar, and when the operating voltage changes, send a feedback signal to the voltage adjustment module a171, so that the voltage adjustment module a171 provides it to the LED driving component according to the feedback signal The voltage of the a161 is adjusted so that the LED driving component a161 can drive the LED strip to maintain its rated normal operating current.
  • the power supply circuit of this embodiment can simultaneously provide a plurality of voltage conversion circuits and LED driving components connected in parallel through the positive first voltage of the first LLC secondary winding and the negative second voltage of the second LLC secondary winding. supplying power, so that the positive output terminals of the first LLC secondary windings can be connected to the multiple voltage conversion circuits to connect one end of the second LLC secondary winding to provide -VLED, so as to realize the parallel connection of the multiple voltage conversion circuits in the power supply circuit, and
  • the LLC secondary winding supplies power to multiple LED drivers at the same time.
  • multiple voltage conversion circuits can each provide the current required by the multiple LED strips to the connected LED driving components, so that the output of each secondary winding can be achieved.
  • the current will not be too large, which can reduce the cost of the voltage conversion circuit, and there is no need to set more secondary windings. All the voltage conversion circuits can share the second LLC secondary winding, which can pass the cost and the circuit structure complexity is low.
  • the circuit structure realizes the ladder power supply.
  • FIG. 12 is a schematic diagram of a circuit structure of a feedback circuit according to one or more embodiments of the present application.
  • each of the LED driving components and the voltage adjustment module in the embodiment shown in FIG. 11 is provided In between, it is used to receive the first feedback signal output by the LED driving component, convert the first feedback signal to obtain a second feedback signal corresponding to the voltage adjustment module, and finally send the second feedback signal to the voltage adjustment module.
  • the feedback circuit a20 disposed between the LED driving component a161 and the voltage adjustment module a171 in the power supply circuit of FIG. 11 is taken as an example.
  • the feedback circuit a20 includes: a VI conversion circuit and a DC-DC voltage feedback circuit, wherein the VI conversion circuit is used to convert the first feedback signal in the form of a voltage signal sent by the LED driving component a161 into a voltage corresponding to the DC-DC voltage feedback circuit.
  • the second feedback signal in the form of a current signal, and realizes level conversion.
  • the DC-DC voltage feedback circuit is used for receiving and sending the second feedback signal to the voltage adjustment module a171.
  • the VI conversion circuit includes: an operational amplifier N1, a transistor V1 and a first resistor R4, and the first input of the operational amplifier N1
  • the terminal (which can be the positive pole) is connected to the LED driving component a161
  • the second input terminal (can be the negative pole) of the operational amplifier N1 is connected to the first terminal of the transistor V1 and the first terminal of the first resistor R4, and the output terminal of the operational amplifier N1 is connected to the transistor
  • the control terminal of V1 and the second terminal of the first resistor R4 are connected to the negative pole of the second LLC secondary winding, so that the reference ground level of the VI conversion circuit is -VLED of the negative pole of the second LLC secondary winding.
  • the DC-DC feedback circuit includes: a second resistor R1, a third resistor R2 and a fourth resistor R3.
  • the first end of the second resistor R1 is connected to the output end VOUT of the voltage adjustment module a171, and the second end of the second resistor R1 is connected to the output end VOUT of the voltage adjustment module a171.
  • the first end of the third resistor R2, the first end of the fourth resistor R3 and the feedback input end of the voltage adjustment module a171, the second end of the fourth resistor R3 is connected to the second end of the triode V1, and the second end of the third resistor R2 Ground, so that the DC-DC feedback circuit is connected to the reference ground.
  • the operational amplifier N1 when the operational amplifier N1 receives the first feedback signal FB sent by the LED driving component a161, it controls V1 to turn on, so that the DC-DC voltage feedback circuit generates from VOUT to the reference ground, and flows through the second resistor R1 and the fourth resistor
  • the current signal of R3, the current signal at the second end of the second resistor R1 can be used as the second feedback signal and input to the feedback input terminal of the voltage adjustment module a171, so that the voltage adjustment module a171 receives the second feedback signal and outputs it to the LED.
  • the voltage VOUT of the drive element a161 is adjusted.
  • FIG. 14 is a schematic diagram of a circuit structure of a feedback circuit according to one or more embodiments of the present application.
  • the feedback circuit shown in FIG. 14 includes: an LED voltage feedback circuit a203 , an isolation circuit a204 and a DC-DC voltage Feedback circuit a201.
  • the DC-DC voltage feedback circuit a201 is connected to the reference ground, and the reference ground of the LED voltage feedback circuit remains the same as that of the LED driving component a161, both of which are connected to the negative pole of the secondary winding of the second LLC, so that the reference ground level is -VLED
  • the isolation circuit a204 is used to electrically isolate the LED voltage feedback circuit a203 and the DC-DC voltage feedback circuit a201 on both sides thereof.
  • the LED voltage feedback circuit is used to generate a first intermediate signal according to the first voltage VOUT and the first feedback signal, and send it to the isolation circuit a204.
  • the isolation circuit converts the first intermediate signal of the LED driving component a161 into a second intermediate signal for output
  • the DC-DC feedback circuit can generate a second feedback signal according to the second intermediate signal and send it to the voltage adjustment module, which can also solve the problem of different reference low levels of the circuits on both sides.
  • FIG. 15 is a schematic diagram of a circuit structure of a feedback circuit according to one or more embodiments of the present application.
  • the isolation circuit a204 may be a switch tube T1
  • the switch tube T1 may be a Triode, MOS tube, etc.
  • the first end of the switch tube T1 is connected to the voltage output terminal VOUT of the voltage adjustment module a171, the second end is connected to the DC-DC voltage feedback circuit a201, and the control end is connected to the LED voltage feedback circuit a203, so that the switch tube T1 can be connected to the LED voltage feedback circuit a203.
  • the isolation is achieved by turning on and off the transmission signal.
  • the DC-DC voltage feedback circuit a201 includes: a second resistor R1, a third resistor R2 and a fourth resistor R3; the first end of the second resistor R1 is connected to the voltage output end of the voltage adjustment module a171, and the second end of the second resistor R1 Connect the first end of the third resistor R2, the first end of the fourth resistor R3 and the feedback input end of the voltage adjustment module a171, the second end of the fourth resistor R3 is connected to the second end of the switch tube T1; The second terminal is grounded, so that the DC-DC feedback circuit a201 is connected to the reference ground.
  • the DC-DC voltage feedback circuit a201 can realize the feedback to VOUT independently, then the resistance value of R1 of the second resistor should be set larger, so that the DC-DC output voltage can reach the set maximum voltage output value, and the fourth The resistor R3 can adjust the minimum value of the output voltage, or the resistance value of the fourth resistor R3 can also be 0.
  • the DC-DC voltage feedback circuit a201 may further include: a feedforward circuit for performing feedforward compensation on the entire DC-DC loop.
  • the feedforward circuit includes a fifth resistor R11 and a second capacitor C1, wherein the first end of the fifth resistor R11 is connected to the voltage output end VOUT of the voltage adjustment module a171, and the second end of the fifth resistor R11 passes through the second capacitor C11 Connect to the feedback input terminal of the voltage adjustment module a171.
  • the LED voltage feedback circuit a203 includes: a reference voltage source N1, a first voltage dividing resistor, a second voltage dividing resistor R9, a bias resistor R4 and a current limiting resistor R5; the first end R7 of the first voltage dividing resistor is connected to the voltage adjustment module a171
  • the output terminal VOUT, the second terminal R8 of the first voltage dividing resistor is connected to the first terminal of the second voltage dividing resistor R9 and the control terminal of the reference voltage source N1, and the first end of the reference voltage source N1 passes through the current limiting resistor R5 in turn.
  • the first end, the second end and the first end and the second end of the bias resistor R4 are connected to the output end VOUT of the voltage adjustment module a171, and the first end of the bias resistor R4 and the second end of the current limiting resistor R5 are connected to the switch tube
  • the control terminal of T1, the second terminal of the reference voltage source N1 and the second terminal of the second voltage dividing resistor R9 are respectively connected to the negative pole of the secondary winding of the second LLC, so that the reference ground level of the LED voltage feedback circuit a203 is the second LLC -VLED of the negative side of the secondary winding.
  • the reference voltage source N1 may be TL431.
  • the reference voltage source N1, the first voltage dividing resistors (R7 and R8) and the second voltage dividing resistor R9 in the LED voltage feedback circuit a203 can jointly realize feedback.
  • VOUT changes VOUT passes through the first voltage dividing resistor and the second voltage dividing resistor.
  • the voltage division of the voltage dividing resistor controls the turn-on and turn-off of the reference voltage source N1.
  • the first feedback signal generated by the constant current control chip in the LED driving component a161 can also be directly sent to the control terminal of the reference voltage source N1 through the resistor R10.
  • the bias resistor R4 is used to provide the bias current of the reference voltage source N1, and the current limiting resistor R5 is used to limit the current.
  • the voltage-stabilizing circuit includes a voltage-stabilizing diode VZ1.
  • a voltage regulator circuit can be used to protect the reference voltage source N1.
  • the LED voltage feedback circuit can perform overall voltage feedback based on the sum of the overall voltage (VOUT and VLED), so as to solve the voltage fluctuation of the fixed voltage first LLC secondary winding by adjusting the bandwidth output of the reference voltage source N1 in the LED feedback circuit The effect of voltage and operating current on LED strips.
  • FIG. 16 is a schematic diagram of a circuit structure of a feedback circuit according to one or more embodiments of the present application. As shown in FIG. 16 , the difference from FIG. 15 is that the isolation circuit is replaced by a switch tube T1 with an optocoupler O1, Then, the connection relationship in the LED voltage feedback circuit needs to be adjusted adaptively.
  • the first end of the reference voltage source N1 is connected to the output end VOUT of the voltage adjustment module a171 through the bias resistor R4, the first end of the current limiting resistor R5 is connected to the output end VOUT of the voltage adjustment module a171, and the second end of the current limiting resistor R5 is connected to the output end VOUT of the voltage adjustment module a171.
  • the terminal is connected to the first input terminal of the optocoupler O1, the first terminal R8 of the first voltage dividing resistor is connected to the second input terminal of the optocoupler O1 through the first capacitor C2, and the first output terminal of the optocoupler O1 is connected to the voltage adjustment module a171.
  • the output terminal VOUT, the second output terminal of the optocoupler O1 is connected to the fourth resistor R3 in the DC-DC voltage feedback circuit a201.
  • FIG. 17 is a schematic diagram of a circuit structure of a feedback circuit according to one or more embodiments of the present application, as shown in FIG. 17
  • FIG. 17 is a schematic structural diagram of a display device according to an embodiment of the present application, as shown in FIG.
  • the display device may include a power supply circuit, a light-emitting diode (LED) drive circuit connected to the power supply circuit, a filter circuit and a feedback circuit, and the filter circuit is also connected to the feedback circuit.
  • LED light-emitting diode
  • the power supply circuit is configured to supply power to the LED driving circuit; wherein, the power supply circuit includes a fixed voltage power supply unit and a variable voltage power supply unit, and the fixed voltage power supply unit is superimposed on the basis of the variable voltage power supply voltage unit to realize stepped power supply to the LED driving circuit .
  • a filter circuit configured to filter voltage ripple in the output voltage of the fixed voltage power supply unit.
  • the feedback circuit is configured to sample the output voltage of the filter circuit, and to feed back the variation of the output voltage to the controller of the variation voltage power supply unit.
  • the controller is configured to control the voltage of the variable voltage power supply unit according to the feedback of the feedback circuit.
  • the feedback sampling point in the output part of the filter circuit in the display device By setting the feedback sampling point in the output part of the filter circuit in the display device, it is possible to indirectly adjust the voltage of the variable voltage part by sampling the output voltage of the filter circuit, and complete the control of the LED driving voltage, which not only realizes When the voltage transmission fluctuates, it can timely feedback to adjust the variable voltage, and when the fixed voltage fluctuates, it can also timely feedback to adjust the variable voltage, which effectively solves the problem of voltage instability;
  • the voltage ripple in the output voltage of the fixed voltage power supply unit avoids the situation of voltage instability due to the introduction of other ripples or noise in the feedback sampling, and further solves the problem of voltage instability during the power supply process of the power supply circuit.
  • the bandwidth frequency of the filter circuit can be any value between greater than 1Khz and less than 60Khz, and in order to ensure the filtering effect, you can set The bandwidth frequency of the filter circuit is 2Khz-10Khz.
  • the filter circuit can be an LC filter circuit, an RC filter circuit, or other types of filter circuits, which can be set according to actual needs, as long as it can filter out the output voltage of the fixed-voltage power supply unit. It is enough to reduce the voltage ripple of the DC-DC module and reduce the attenuation of the switching ripple output by the DC-DC module.
  • FIG. 18 is a schematic diagram of a circuit structure of a feedback circuit according to one or more embodiments of the present application.
  • the filter circuit is an RC filter circuit as an example, including a first resistor and a first capacitor , wherein one end of the first resistor is respectively connected to the output end of the fixed voltage power supply unit and the LED drive circuit; the other end of the first resistor is respectively connected to one end of the first capacitor and the feedback circuit connection; the other end of the first capacitor is respectively connected with the fixed voltage power supply unit and the variable voltage power supply unit.
  • the first resistor and the first capacitor can form a low-pass filter circuit.
  • the voltage ripple in the output voltage of the fixed-voltage power supply unit passes through the low-pass filter circuit, the voltage ripple in the output voltage will be greatly attenuated.
  • the first resistor and the second resistor, the third resistor and the fourth resistor in the feedback circuit can form a high-pass filter circuit, and the high-pass filter circuit can effectively output the DC-DC module.
  • the switching ripple is included in the feedback sampling and fed back to the controller of the variable voltage power supply unit, which can not only filter out the voltage ripple in the output voltage of the fixed voltage power supply unit, but also reduce the switching ripple output by the DC-DC module.
  • the filter circuit when the filter circuit includes a first resistor and a first capacitor, if the value of the first resistor is larger, the value of the first capacitor is smaller, In this way, although the bandwidth position of the filter circuit can be about 2Khz-10Khz, if the switching ripple output by the DC-DC module passes through the first capacitor, it will cause greater attenuation, which is not conducive to the stable operation of the DC-DC module. Therefore, in general, a first resistor with a smaller resistance value and a first capacitor with a larger capacitance value can be set. For example, if the resistance value of the first resistor in the filter circuit can be 200 ohms, and the capacitance value of the first capacitor can be 100n, the bandwidth frequency of the filter circuit is 5Khz.
  • the feedback sampling voltage collected by the feedback circuit is U
  • the voltage U1 output by the fixed voltage power supply unit includes the DC component voltage u1 and the voltage ripple u1
  • the voltage U2 output by the DC-DC module includes the DC component voltage u2 and the working ripple u2
  • the switching voltage ripple can be reduced, and the voltage fluctuation in the fixed voltage power supply unit can be included as much as possible in the feedback sampling to the controller of the variable voltage power supply unit, which solves the problem that the voltage does not vary during the power supply process of the power supply circuit in the COT mode.
  • the stability problem ensures the stable operation of the DC-DC module.
  • the feedback circuit may include: a feedback resistor unit and a differential feedback unit; the feedback resistor unit is respectively connected to the output terminal of the filter circuit, the LED driving circuit and the controller; the differential feedback unit is respectively connected to the output terminal of the filter circuit, the feedback terminal Resistor unit connection.
  • the feedback resistor unit may include: a second resistor, a third resistor, a fourth resistor and a fifth resistor; as shown in FIG. 17 , one end of the second resistor is connected to the output end of the filter circuit; the second resistor The other end of the third resistor is connected to one end of the third resistor and one end of the fifth resistor; the other end of the third resistor is connected to one end of the fourth resistor and the controller; the other end of the fourth resistor is grounded; the other end of the fifth resistor is connected to the LED drive circuit connection.
  • the differential feedback unit may include: a second capacitor; wherein one end of the second capacitor is connected to the output end of the filter circuit; the other end of the second capacitor is connected to one end of the fifth resistor.
  • the differential feedback unit includes: a second capacitor and a sixth resistor; as shown in FIG. 17 , one end of the sixth resistor is connected to the output end of the filter circuit; the other end of the sixth resistor is connected to the output end of the filter circuit; One end of the second capacitor is connected; the other end of the second capacitor is connected to one end of the fifth resistor.
  • variable voltage power supply unit may include: a power supply module, a controller, an inductor and a third capacitor; the power supply module is connected to the controller; the controller is connected to one end of the inductor; the other end of the inductor is connected to one end of the third capacitor Connect; the other end of the third capacitor is grounded.
  • the controller is a controller in a COT mode with a fixed on-time, for example, a BUCK topology controller.
  • the sixth resistor and the second capacitor form differential feedback, the response speed of DC-DC is increased.
  • the capacity of the third capacitor is too large, the charge will not be released after the shutdown, and the residual voltage will be high.
  • the fixed voltage output will be superimposed when the third capacitor is turned on next time, causing the LED light bar to flicker. Therefore, in some embodiments,
  • the capacity of the second capacitor is equal to that of the third capacitor, or the capacity of the third capacitor is smaller than that of the second capacitor, which can solve the problem of flickering of the LED light bar when starting up, and can reduce the cost.
  • the capacitance value of the third capacitor is smaller than the capacitance value of the second capacitor, and the difference between the capacitance value of the third capacitor and the capacitance value of the second capacitor is smaller than the difference threshold.
  • the difference threshold may be set according to actual needs.
  • the value of the difference threshold is not further limited in this embodiment of the present application.
  • FIG. 19 is a schematic diagram of a circuit structure of a feedback circuit according to one or more embodiments of the present application.
  • the variable voltage power supply unit further includes a seventh resistor, and one end of the seventh resistor is connected to the third resistor. One end of the capacitor is connected; the other end of the seventh resistor is connected with the other end of the third capacitor.
  • the purpose is to use the seventh resistor to consume the circuit in the third capacitor when the display device is turned off, so as to avoid high residual voltage of the third capacitor when the display device is turned off, so as to solve the problem of flickering of the LED light bar when the display device is turned on.
  • FIG. 20 is a schematic structural diagram of a display device according to one or more embodiments of the present application.
  • the display device includes a backlight module and a display panel.
  • the backlight module is provided with multiple power sources, controllers, and lamp areas corresponding to the multiple power sources;
  • the multiple power sources include two types of power sources, one type of power source is the first power source, and the first power source is used to control the
  • the device provides a positive power supply signal and drives the lamp area corresponding to the first power supply to work.
  • Another type of power source is a second power source, and the second power source is used to drive the lamp area corresponding to the second power source to work.
  • the correspondence between the power supply and the lamp area in this embodiment may be that one power supply corresponds to multiple lamp areas, or one power supply corresponds to one lamp area; and the first power supply and the second power supply are respectively The number of can be one or more, which is not specifically limited.
  • the lamp area emits light by receiving the driving signal generated by the controller, wherein the driving signal generated by the controller is generated by negative pressure driving.
  • multiple power supplies are used to output negative power supply signals and negative reference signals.
  • the signal is generated by the controller through the control signal and the negative supply signal, negative reference signal received from the power source.
  • the controller in this embodiment can also be used to control the first power supply to work and the second power supply to turn off in the standby mode. In the non-standby mode, both the first power supply and the second power supply are in a working state by controlling.
  • FIG. 21 is a schematic structural diagram of a backlight module according to one or more embodiments of the present application, as shown in FIG. 24 , in FIG. 24 only two power sources and two lamp zones are used as examples, and one power source Corresponding to a lamp area, the power source a corresponds to the lamp area a, and the power source b corresponds to the lamp area b.
  • the power supply a is the first power supply mentioned in FIG.
  • the power supply b is the second power supply mentioned in FIG. 20 , which provides a negative reference signal and a negative power supply signal for the main board, so that the controller is under the action of the reference signal of the power supply b, the power supply signal and the control signal generated by the controller through an external command, Drive the lamp area b to emit light.
  • a plurality of power sources drive the lamp areas corresponding to the power sources through the controller.
  • FIG. 22 is a schematic diagram of the current flow of the lamp area according to one or more embodiments of the present application, as shown in FIG. 22 , wherein the driving mode of the controller is the existing positive voltage driving mode.
  • the current of the lamp area b starts from the corresponding power supply b corresponding to the lamp area b, and passes through the controller, the positive terminal of the lamp area b, the negative terminal of the lamp area b, The controller returns to the corresponding power source b, forming a current loop.
  • the power supply b is the power supply signal of the light-emitting driving module, which is a positive electrical signal.
  • FIG. 23 is a schematic diagram of the current flow of the lamp area according to one or more embodiments of the present application.
  • the current flow of the lamp area b is: Starting from the corresponding power source b corresponding to the lamp area b, through the back panel, the positive terminal of the lamp area b, the negative terminal of the lamp area b, and the controller to return to the corresponding power source b.
  • the power supply signal of the power source b is the negative power supply signal of the light-emitting drive module.
  • Figure 23 only shows a schematic diagram of the current flow between any power supply in the multi-power supply and its corresponding lamp area in the negative voltage driving mode, and the current flow loops between the other power supplies and their corresponding lamp areas are the same, and in Figure 23 The dotted line only represents the current flow, not the actual connection line.
  • the driving mode of the lamp area in the display device is the negative pressure drive mode.
  • the positive terminal of the lamp area can be connected to the back panel by screws. Or directly grounded, through the above connection relationship, the connection lines between the lamp area and the controller and the number of connectors for the connection lines can be reduced, thereby reducing the area of the circuit board occupied by the controller.
  • FIG. 24 is a schematic structural diagram of a power supply according to one or more embodiments of the present application.
  • the second power supply includes: a coil winding module b41 and a first isolation voltage conversion module b42.
  • the coil winding module b41 is coupled with the primary coil in the first isolation voltage conversion module b42, and the coil winding module b41 is connected to the lamp area through the controller; the first isolation voltage conversion module b42 can be used to receive power supply signals, and to receive power The voltage of the power supply signal is converted to output a negative reference signal, and provided to the controller and the coil winding module b41; the coil winding module b41 is used for coupling after receiving the power supply signal and the negative reference signal generated by the first isolation voltage conversion module b42 The negative power supply signal is obtained and provided to the controller; wherein, the negative power supply signal and the negative reference signal are used to provide the controller to generate the driving signal.
  • FIG. 25 is a schematic structural diagram of a power supply according to one or more embodiments of the present application.
  • the filtering module b51 filters the received commercial power, such as high-frequency filtering, etc.
  • the filtering module b51 may not be provided.
  • the filtering and rectifying module b52 performs filtering and rectifying on the filtered signal, and converts the received AC wave signal into a full-wave signal.
  • the phase of the power supply signal generated by the filtering and rectifying module b52 is adjusted by the power factor correction module b53, so that the phases of the current and the voltage are the same, and the power factor of the power supply can be effectively improved.
  • the power factor correction module b53 may not be set in the .
  • the power factor correction module b53 provides the corrected power supply signal to the coil winding module b41 and the first isolation voltage conversion module b42.
  • the addition of the coil winding b41 can output a negative power supply signal and a negative reference signal to the controller, so that the controller can drive the lamp area to work by means of negative pressure driving.
  • FIG. 26 is a schematic structural diagram of a power supply according to one or more embodiments of the present application.
  • the first power supply includes: a coil winding module b71 , a second isolation voltage conversion module b72 and a third power supply
  • the isolation voltage transformation module b73; the second isolation voltage transformation module b72 is used to receive the power supply signal, and by performing voltage transformation on the power supply signal, the second isolation voltage transformation module b72 generates a positive power supply signal, and provides the positive power supply signal to the same as the first power supply signal.
  • the controller connected to the output end of the two isolated voltage conversion modules b72.
  • the third isolation voltage transformation module b73 is configured to receive the power supply signal, and by performing voltage transformation on the power supply signal, the third isolation voltage transformation module b73 generates a negative reference signal; the coil winding module b71 and the second isolation voltage transformation module b72 are coupled and connected, And the coil winding module b71 is connected to the controller, the coil winding module b71 is used for receiving the power supply signal and the third isolation voltage transforming module b73 generates a negative reference signal, and the coupling obtains the negative power supply signal; wherein, the negative power supply signal and the negative reference signal are both used for Provided to the controller to generate drive signals.
  • a negative power supply signal and a negative reference signal can be output to the controller, so that the controller can drive the lamp area to work by means of negative pressure driving, and can also provide the controller with a positive power supply signal so that the controller can Work.
  • FIG. 27 is a schematic structural diagram of a power supply according to one or more embodiments of the present application.
  • the first power supply includes: a step-down module b81 , a first voltage conversion module b82 and a second voltage Transform module b83.
  • the first voltage conversion module b82 is used for voltage conversion of the received power supply signal to obtain a positive power supply signal, and sends the positive power supply signal to a controller connected to its output to supply power to the controller.
  • the second voltage transformation module b83 is configured to perform voltage transformation on the received power supply signal to obtain a negative reference signal, and send the negative reference signal to the controller connected thereto and the step-down module b81.
  • the first input terminal of the step-down module b81 is connected to the second voltage conversion module b83, the second input terminal of the step-down module b81 is grounded, and the step-down module b81 is used to output a negative power supply based on the negative reference signal generated by the second voltage conversion module b83 signal, and output the negative power supply signal to the controller connected to it; wherein, the negative power supply signal and the negative reference signal are used to provide the controller to generate a driving signal to drive the lamp area to work, and the step-down module b81 can reduce the voltage through some Circuits, such as DC-DC converters such as Buck circuits, can also be implemented by low dropout linear regulators (Low Dropout Regulators, LDOs for short).
  • DC-DC converters such as Buck circuits
  • FIG. 28 is a schematic structural diagram of a power supply according to one or more embodiments of the present application.
  • the second power supply includes: a step-down module b91 and a third voltage conversion module b92; a third voltage
  • the conversion module b92 is used for receiving the power supply signal, and performing voltage conversion on the power supply signal to obtain a negative reference signal, which is provided to the step-down module b91 connected to it; the first input end of the step-down module b91 is connected to the third voltage conversion module b92, The second input end of the step-down module is grounded, and the step-down module b91 is configured to output a negative power supply signal to the controller connected to the output end of the third voltage transform module b92 based on the negative reference signal generated by the third voltage transform module b92;
  • the power supply signal and the negative reference signal are used to provide the controller to generate the driving signal to drive the lamp area to work, and the step-down module b91 can be implemented by some step-down circuit
  • this power supply method is suitable for when the negative reference voltage is set low enough, and a step-down circuit or a low-dropout linear regulator can be directly used for step-down operation to obtain a negative power supply signal.
  • the device of this embodiment is also easier to implement.
  • FIG. 29 is a schematic structural diagram of an isolation manner in a negative voltage driving mode according to one or more embodiments of the present application.
  • two power sources, power source a and power source b are taken as examples, where the power source a is the first power supply, and the power supply b is the second power supply.
  • the reference ground of the microprocessor is the negative reference signal generated by the power supply
  • the reference ground of the main board is the earth, it is necessary to set a first isolation module between the main board and the light-emitting driver module at this time, that is, the main board and the light-emitting driving module.
  • the microprocessors are connected through a first isolation module.
  • the first isolation module is used to perform level conversion on the control signal generated by the main board, and send the obtained control signal to the microprocessor for analysis, which ensures that the signal between the main board and the microprocessor can be transmitted normally and avoids the The reference grounds between them are different, resulting in interference between the signals and failure of normal transmission.
  • the first isolation module for high-frequency signals (such as clock signals, synchronization signals, etc.), capacitive isolation devices or magnetic isolation devices can be used to isolate the two reference grounds, while for low-frequency signals (such as chip select signals) , which can be directly realized by a non-isolated level conversion circuit.
  • the output signal of the main board is respectively connected to the input end of the isolation device and the level conversion circuit in the first isolation module, and the output end of the isolation device and the level conversion circuit in the first isolation module is connected to the microprocessor connected to the controller module.
  • FIG. 29 does not show the connection mode of the lamp area a and the lamp area b.
  • the negative reference voltages generated by the power supply a and the power supply b are different, that is, the negative reference voltage that the power supply a provides to the microprocessor and the IC chip a is the same reference ground, but the power supply b provides the negative reference voltage of the IC chip b.
  • the reference voltage is another reference ground, and the reference grounds of the two negative reference signals are different. Therefore, a first isolation module still needs to be provided between the microprocessor and the IC chip b, which is not shown in FIG. 29 .
  • FIG. 30 is a schematic structural diagram of an isolation manner in a negative pressure driving mode according to one or more embodiments of the present application.
  • the reference ground of the microprocessor is the same as that of the motherboard, this At this time, since the reference ground between the microprocessor and the two constant current drive modules in the figure is different, two second isolation modules are set at this time, and the second isolation module is used to analyze the control signal of the microprocessor Level conversion is performed, and the converted control signal is sent to the corresponding constant current driving module, and the second isolation module and the constant current driving module are in one-to-one correspondence.
  • the constant current driving module receives the negative reference signal and the negative power supply signal, and provides the corresponding lamp area with a driving signal according to the converted control signal, the negative reference signal and the negative power supply signal.
  • the input terminals of the two second isolation modules can be connected to the microprocessor, and the output terminals of the two second isolation modules are respectively connected to the input terminals of the corresponding constant current drive modules (ie, respectively connected to the IC chip).
  • the two second isolation modules perform level conversion on the signal analyzed by the microprocessor, and then send it to the corresponding constant current drive module.
  • the isolation method can ensure that signals can be transmitted between different reference grounds, and avoid electromagnetic interference of signals due to different reference grounds.
  • the above-mentioned display device further includes a plurality of switches, and there is a one-to-one correspondence between the power supplies and the switches. And multiple power sources can also be connected through switches.
  • one connection method is: the power supply that will supply power to the main board is used as the main power supply, and the remaining power supplies can be connected to the filter module in the main power supply through the corresponding switch, and the switch can use the switch indication signal to control it. Control, the specific switch control signal is sent by the main board.
  • the present application further provides a display control method, which is applied to the above-mentioned display device.
  • the method includes, step 101, determining whether it is currently in a standby mode.
  • Step 102a controls the first power supply to work and controls the second power supply to turn off if it is currently in the standby mode.
  • Step 102b controls the first power supply and the second power supply to work if it is currently in the non-standby mode.
  • the first power supply connected to the controller can be turned on, so that the power supply can provide a positive power supply signal to the main board.
  • the controller may receive a user's control instruction on the display device to determine whether the current display device is in the standby mode. For example, the controller can receive the user's operation of the power button on the display device and the operation of the button to start the display device. If the user turns on the power button of the display device and the display device is not activated, it means that the current display device is in standby mode; After pressing the power button, continue to start the display device through the button, it means that the current display device is in the non-standby mode. After determining the current mode, the controller controls the working state of the power supply in the display device.
  • the controller can control the second power supply to be turned off while the first power supply continues to work; when the display device is currently in the non-standby mode, the controller can control the first power supply and the second power supply to work simultaneously .
  • Each power supply may be provided with a switch device, and the switch device may be used to receive a switch control signal sent by the controller to control the power supply to start or stop working.
  • the controller controls the power on and off in the standby and non-standby modes of the display device, which can reduce the power consumption of the display device and the loss of the display device, and prolong the service life of the display device.
  • the negative power supply signals and the negative reference signals of the multiple power sources are also matched with the power of the light-emitting elements in the corresponding lamp area; that is, before step 101, the light-emitting elements of the same power also need to belong to the same lamp area. According to the rules, all light-emitting elements of the backlight module are divided to obtain multiple lamp areas.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Dc-Dc Converters (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

L'invention concerne un appareil d'affichage et un circuit d'alimentation d'étage, un point d'échantillonnage de rétroaction est disposé au niveau d'une partie de sortie d'un circuit de filtre dans l'appareil d'affichage, ce qui permet le réglage indirect de la tension d'une partie de tension variable au moyen de l'échantillonnage d'une tension de sortie du circuit de filtre et qui permet la réalisation d'une commande de la tension d'attaque de DEL, ce qui met non seulement en œuvre une rétroaction opportune pour effectuer un réglage de tension variable lorsqu'une tension variable fluctue, mais qui permet également une rétroaction opportune pour effectuer un réglage de tension variable lorsqu'une tension fixe fluctue, et qui résout efficacement le problème de l'instabilité de la tension ; de plus, l'instabilité de tension provoquée par d'autres facteurs comme une ondulation ou un bruit introduit en raison de l'échantillonnage de rétroaction est évitée au moyen du filtrage de l'ondulation de la tension par le circuit de filtre dans une tension de sortie d'une alimentation électrique à tension fixe située dans l'appareil d'affichage, résolvant le problème de l'instabilité de la tension lorsqu'un circuit d'alimentation électrique fournit de l'énergie.
PCT/CN2021/095347 2020-08-24 2021-05-21 Appareil d'affichage et circuit d'alimentation d'étage WO2022041873A1 (fr)

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CN202010857296.4A CN111901932B (zh) 2020-08-24 2020-08-24 显示装置
CN202010857296.4 2020-08-24
CN202110138504.X 2021-02-01
CN202110138504.XA CN112785971B (zh) 2020-03-18 2021-02-01 显示装置及负压阶梯供电电路
CN202110177726.2A CN114913817B (zh) 2021-02-07 2021-02-07 显示装置及显示控制方法
CN202110177726.2 2021-02-07

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